CSL - Wireless Vertical Ergonomic USB Mouse, Bluetooth + 2,4 Ghz Wireless Optical Mouse TM137U, Mouse without cable 5 Buttons 2400 dpi Prevention against mouse arm tennis elbow For PC Laptop Macbook

As a long time sufferer of RSI and having previously tried the Logitech M570 trackball cordless, I thought I'd give this a try. The Logitech M570 was brilliant for 6 months till my thumb became very tender and painful which is a shame because that is a very high quality piece of kit. I may return to it once the thumb recovers, though this may turn out to be temporary because it is heavy on the thumb. Ordinary mice are out of the question, just a day with one makes the RSI return with a vengeance. It isn't as sophisticated in action as the Logitech M70 Trackball. I wish Logitech would do something like this, there is clearly a market for it as I'm sure those of us crippled with RSI will buy them.Enough moaning about my cold dead hand and the R&D failures of Logitech and onto this little rodent: No drivers to install, it uses the generic drivers in Windows, so it's plug and play and installs pretty much instantly. Inserted the dongle into a spare USB port, added the batteries to the mouse - they were included, alkalines too. Then nothing happened on the mouse end, no lights, so I took out the batteries, put them in again and it woke up flashing red on the stripe which is the only time the flashy curl on the side of the mouse actually does anything. Build quality is good, much better than I was expecting at this price. It's quite light and comfortable to hold.After eleven days of use, I must say the RSI hasn't yet returned. I'm sure this is to do with the more vertical hand position, there is no tiny turn needed at the shoulder which keeps the deltoid and trapezius muscles on the right in tension, leading to neck pain on the opposite side, due to the body attempting to balance forces using the left trapezius. There's no twist or strain on the forearm muscles or wrist either. Consequently, you are able to use this mouse with a much more relaxed position, comfortable too if you get a bean bag wrist rest.The middle click takes a lot of force, and it's given another facet to my RSI. Switched back to my Logitech Trackball till my thumb hurts. I can't believe I have to switch between three mice. Bring on thought controlled cursors, then all I'd have to worry about is headaches and brain tumours.I have no idea what the gentleman is on about in one of the reviews where he complains about the mouse moving when you click the left button - this will not happen if you possess a thumb. It works brilliantly, though it's a little bit dozy, meaning it nods off to sleep within a couple of minutes but you can easily wake it up by moving the mouse wheel up and down a bit. There is no indication of what DPI you are on when you press the DPI toggle switch - it's using generic drivers so there is no real facility for it to tell you. This mouse very occasionally (very rarely) misses left clicks made while the mouse is still moving but that's a minor niggle compared to the pain it saves you. You get used to it very quickly and compensate subconsciously. This is the sort of thing that would have been fixed by proprietary drivers and software had the manufacturers programmed them, which they would have if they were Logitech, who sadly don't make vertical mice. If Logitech had made this, the Forward/Back buttons could be programmed to do things like Cut/Paste or Page Up/Down for instance, or indeed any available key combination, but those buttons are not programmable on this device.My verdict: Really, if you have RSI, get this.Update: After using this mouse for over a year, my hand developed RSI in brand new ways, too much twisting at the wrist because the angle is not close enough to vertical, this mouse is not vertical enough! After much deliberation, I bought an Evoluent, sure it's expensive (and the Evoluent mouse software setup is not a matter of plug and play, very lazily programmed), but bearing in mind RSI stops me making a living so the buying substantially more expensive Evoluent made sense, it's much more upright and occasionally the pain returns in the hand (not the arm, shoulder or neck), which is when I switch back to this less vertical mouse for a few days, then back to the Evoluent etc. Let's face it, gripping mice while sitting at a desk is not something we have evolved to do, therefore those of us with RSI will always suffer with it to some extent. This mouse is a good start but I find switching between mice of various types prevents the buildup of RSI pain. When fingertips become paiful, soaking individual fingers in Ibuprofen helps: wrap each digit in gel filled cling film for an hour at a time.

Good alternative mouse which works surprisingly well.I bought it as it was best value from the various options. It also has replaceable batteries - which keeps the replacements under your control and not relying on a 'locked-in' battery.Good weight and shape which feels better than it's price. You can almost forget that it is a cheap copy.Other reviews negative issues were not a problem for me. The 'ratcheted' wheel works fine as the movements are small. The click to reactivate (rather than move) is also OK. If you want these functions you can pay a lot more. Also there is no distracting light in normal operation.A nice feature is that the transmitter slides within the body of the mouse so keeping them together.I have used it on a few machines with no problem.One issue I did note is that if you go back and forth from the mouse and keyboard that the top 'fin' can get in the way. Just needs some adaptation of movement by the user.My wrist feels much better so top marks for the very reasonable price.-------------------------------------------------------------------------------------------------------After 6 weeks of use it's settled into regular use. It has survived a few drops and is working well.I do miss the 'feel' of a quality mouse - but the £60 saving more than compensates...

This mouse was so good I bought it twice, after the first one went to my second PC.Pros:Very functional in terms of what it's meant to do. Easy to use.Very comfortable, both ergonomically, and the texture of the mouseSensitive mouse that responds well.Good enough cable length for more situationsVery good value for money.Clicks are satisfying and accurate.Looks greatConsThe material of the mouse can get sticky if you're not careful and use it with oily hands. So, keep your hands clean and the mouse will feel great. Otherwise it can get sticky and doesn't actually clean very well. This is because of the material.Might have been nice if the side light was LED and could be changed, but sadly it's just blue and cannot be turned off.